Re: GNU Radio on Raspberry Pi 4?

[Marcus Müller]

Can't stress this enough. Running a 32 bit Linux on a RPi 4 would be
like running Windows 98 on a modern PC and expecting top performance
from the CPU. You're not making use of the CPU you have, you're only
making use of a legacy mode that it still supports.

Best regards,
Marcus

On 17.12.20 10:53, Albin Stigö wrote:
> 64bit mode is most likely better because in addition to being 64bit it
> enables additional cpu features (certain new instructions and more SIMD
> NEON registers)
> 
> On Thu, Dec 17, 2020, 10:36 jean-michel.friedt@femto-st.fr
> <mailto:jean-michel.friedt@femto-st.fr> <jean-michel.friedt@femto-st.fr
> <mailto:jean-michel.friedt@femto-st.fr>> wrote:
> 
>     The benchmark on volk/64 bit kernel v.s 32 bit Raspbian is at
>     https://pubs.gnuradio.org/index.php/grcon/article/view/73/55
>     <https://pubs.gnuradio.org/index.php/grcon/article/view/73/55>
>     last page. I get 3 to 7-fold improvement by volk_config on a dedicated
>     toolchain for 64-bit CPU.
> 
>     JM
> 
>     --
>     JM Friedt, FEMTO-ST Time & Frequency, 26 rue de l'Epitaphe, 25000
>     Besancon, France
> 
>     December 17, 2020 10:28 AM, "Kristoff" <kristoff@skypro.be
>     <mailto:kristoff@skypro.be>> wrote:
> 
>     > HI all,
>     >
>     > I also have a RPi4 (*).
>     > Some follow-up question.
>     >
>     > What OS would be the best for this?
>     > Would running 64 bit make a difference?
>     >
>     > I don't know to what degree this is related, but I did a test running
>     > WebGL (**) on that pi, and I got about 1/3 of the frames per
>     second on
>     > my RPi4 compared to my laptop (which only has a UHD Graphics 630
>     Mobile,
>     > so not the  best or latest neither)
>     > Is the GPU in the Pi4 good enough to run many GUI elements in GNU
>     Radio
>     > at the same time?
>     >
>     > Kr.
>     >
>     > (*) RPi4B 8 GB, 120 SSD
>     >
>     > (*) https://webglsamples.org <https://webglsamples.org>
>     >
>     > On 16/12/2020 11:10 p.m., Dan Romanchik KB6NU wrote:
>     >
>     >> Has anyone successfully run GNU Radio on a Pi 4? I recently purchased
>     >> an RTL-SDR dongle and thought it would be fun to experiment a little
>     >> with GNU Radio and learn something about SDR.
>     >>
>     >> A couple of days ago, I fired up GNU Radio, and after having some
>     >> trouble figuring out how to get the audio sink to talk to the Pi, I
>     >> downloaded VE6EY's FM receiver flow graph. The flow graph runs, but
>     >> the Pi 4 just doesn't seem to have enough horsepower to run it in
>     real
>     >> time. The audio is slow and distorted.
>     >>
>     >> Thinking that it might be the WX widgets slowing down the program, I
>     >> first deleted the FFT display widgets, then converted the WX slider
>     >> controls to QT range controls. Neither had any effect on how well the
>     >> flow graph ran.
>     >>
>     >> GQRX and CubicSDDR seem to work just fine. At least with both of
>     them,
>     >> I'm able to receive FM broadcast and NOAA weather station. But, maybe
>     >> the PI4 just doesn't have enough horsepower to run GNU Radio? If so,
>     >> that's kind of disappointing.
>     >>
>     >> 73! <—ham radio lingo for “best regards"
>     >>
>     >> *Dan KB6NU*
>     >> CW Geek, Ham Radio Instructor
>     >> Author of the "No Nonsense" amateur radio license study guides
>     >> Read my ham radio blog at http://www.kb6nu.com <http://www.kb6nu.com>
>

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